// SPDX-FileCopyrightText: 2025 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only
#ifndef JFJOCH_INDEXERTHREADPOOL_H
#define JFJOCH_INDEXERTHREADPOOL_H


#include <thread>
#include <mutex>
#include <condition_variable>
#include <queue>
#include <functional>
#include <future>
#include <vector>
#include <optional>
#include <memory>
#include <latch>

#include "../common/JFJochMessages.h"
#include "../common/DiffractionSpot.h"
#include "../common/DiffractionExperiment.h"
#include "../common/NUMAHWPolicy.h"
#include "Indexer.h"

class IndexerThread {
    struct TaskInput {
        const DiffractionExperiment &experiment;
        const std::vector<Coord> &recip;
    };

    bool stop = false;
    enum class TaskState {STARTING, IDLE, READY, RUNNING, COMPLETED, ERROR} state = TaskState::STARTING;
    std::mutex m;
    std::condition_variable c_running;
    std::condition_variable c_start;
    std::condition_variable c_done;
    std::unique_ptr<IndexerResult> result = nullptr;
    std::unique_ptr<TaskInput> task_input = nullptr;
    std::thread worker_thread;

    void Worker(const IndexingSettings& settings, int threadid);
public:
    IndexerThread(const IndexingSettings& settings, int threadid);
    ~IndexerThread();
    std::unique_ptr<IndexerResult> Run(const DiffractionExperiment &experiment, const std::vector<Coord> &recip);
    void Finalize();
};

class IndexerThreadPool {
    std::mutex m;
    std::condition_variable c;
    std::vector<uint8_t> worker_busy;
    size_t worker_free_count;
    std::vector<std::unique_ptr<IndexerThread>> tasks;
    const int64_t viable_cell_min_spots;
    const bool blocking;
    int GetFreeWorker();
public:
    IndexerThreadPool(const IndexingSettings& settings);
    IndexerResult Run(const DiffractionExperiment& experiment, const std::vector<Coord>& recip);
};


#endif //JFJOCH_INDEXERTHREADPOOL_H